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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd93dfbbb2e3301d85bc92efeb59c82cfd862be9fb3b8de40eddab740e4989b49' 
  AND token = 'oxU13Y1hGeD/1WFbAbQ/bdVoF6RzeNfL22RTFcibzjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}